Timo wrote:

There is some merit to the famous backstage rationalization (printed e.g. in Shane Johnson's Mr Scott's Guide to the Enterprise) that scuttling near planets is normally done gently ...
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Ugh, I really don't like explanations like that, there's way to much overthinking going on. They wanted to blow up the Enterprise in a visually intersting way, it was one of the biggest fx scenes of the movie, they didn't just want a big boom and the Enterprise disappearing in a ball of fire right away.